Description
SKTestSession.setSimulatedError() does not throw the configured error when testing StoreKit with the .loadProducts API in iOS 26.2. The simulated error is ignored, and products load successfully instead.
Environment
iOS: 26.2 (Simulator)
Xcode: 26.2 beta 2 (Build 17C5038g)
macOS: 15.6.1
Framework: StoreKitTest
Testing Framework: Swift Testing
base project: https://developer.apple.com/documentation/StoreKit/implementing-a-store-in-your-app-using-the-storekit-api
Expected Behavior
After calling session.setSimulatedError(.generic(.notAvailableInStorefront), forAPI: .loadProducts), the subsequent call to Product.products(for:) should throw StoreKitError.notAvailableInStorefront.
Actual Behavior
The error is not thrown. Products load successfully as if setSimulatedError() was never called.
Steps to Reproduce
Create an SKTestSession with a StoreKit configuration file
Call session.setSimulatedError(.generic(.notAvailableInStorefront), forAPI: .loadProducts)
Call Product.products(for:) with a valid product ID
Observe that no error is thrown and the product loads successfully
Sample Code
import StoreKitTest
import Testing
struct SKDemoTests {
let productID: String = "plus.standard"
@Test
func testSimulatedErrorForLoadProducts() async throws {
let storeKitConfigURL = try Self.getStoreKitConfigurationURL()
let session = try SKTestSession(contentsOf: storeKitConfigURL)
try await session.setSimulatedError(
.generic(.notAvailableInStorefront),
forAPI: .loadProducts
)
try await confirmation("StoreKitError throw") { throwStoreKitError in
do {
_ = try await Self.execute(productID: productID)
} catch let error as StoreKitError {
guard case StoreKitError.notAvailableInStorefront = error else {
throw error
}
throwStoreKitError()
} catch {
Issue.record(
"Expect StoreKitError. Error: \(error.localizedDescription)"
)
}
}
#expect(session.allTransactions().isEmpty)
}
static func execute(productID: String) async throws {
guard
let product = try await Product.products(for: [productID]).first(
where: { $0.id == productID })
else {
throw NSError(
domain: "SKDemoTests",
code: 404,
userInfo: [NSLocalizedDescriptionKey: "Product not found for ID: \(productID)"]
)
}
_ = product
}
static func getStoreKitConfigurationURL() throws -> URL {
guard
let bundle = Bundle(identifier: "your.bundle.identifier"),
let url = bundle.url(forResource: "Products", withExtension: "storekit")
else {
fatalError("StoreKit configuration not found")
}
return url
}
}
Test Result
The test fails because the expected StoreKitError.notAvailableInStorefront is never thrown.
Question
Is this a known issue in iOS 26.2 / Xcode 26.2 beta 2, or is there a different approach required for simulating errors with SKTestSession in this version? Any guidance would be appreciated.
Feedback Assistant report: FB21110809
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